Calculating machine



Dec. 7, 1937. E. c. WALTER CALCULATING MACHINE Filed Feb. 19, 1937 INVENTOR EDWARD C. M/AL TE/Z @CU. Clmdmodn f/dh ATTORNEY Patented Dec. 7,1937

UNITED STATES PATENT OFFICE Monroe Calculating Machine Company, Or-

ange, N. 1., a corporation of Delaware Application February 19, 1937, Serial No. 126,899

2 Claims.

The invention has relation to calculating machines, capable of making any number of cycles of continuous rotation and constructed in accord with the disclosure of the U. S. patent to A. A. 5 Overbury, issued June 26, 1934, No. 1,964,211, and other patents of the well-known Monroe type, having for an object the provision of improved means for locating the actuating mechanism of the machine at rest in full cycle position.

The invention consists in the novel construction and combinations of parts as hereinafter set forthin the claims.

In the accompanying drawing, I Figure 1 is a side view of the machine to which the invention is applied with parts broken away and parts removed.

Figure 2 is a view of the opposite side of the machine with parts broken away, showing the invention applied to one of the main operating shafts of the machine.

Figure 3 is a similar view with the spring tensioned members moved outwardly and so held.

Figure 4 is a similar view showing the holding means for said spring tensioned members released and said members moved inwardly to the In the drawing, and as more fully described in said patent, trigger 3| normally engages a pawl 25, mounted upon a stop arm 24, and serves 'to' hold said pawl inactive, and on release of a general operation key (not shown) said tri ger will be raised and pawl 25 released, the latter dropping lnto position behind a shoulder 21 of rock arm 22, connected to shaft 4 by crank 29 and link 85 2|. This connects the arms 22 and 24 to move in unison, the latter arm being carried forwardly against a fii'ced stop 2% to prevent further opera 7 the main operating shafts of the machine, is-

fixed a cam I, having diametrically opposite low points 2, 2; arms or members 3, 3', pivoted in com- 5 mon at one end thereof at 5, being provided at their free ends each with a roller 6, and having'a spring connection I, and a toggle joint connection 8, said rollers normally engaging said low points of the cam.

55 On initial movement of the actuating mechanism of the machine, said cam acts to move said members outwardly, and to move the links of said toggle joint connection outwardly towards centralized position, against the tension of said sprlngconnection, said cam having a projection 9, engaging said toggle joint connection to move the links thereof further outwardly through and slightly beyond centralized position, one of said links havinga projection l0 engaging the adjacent of said members 3, 3, as seen in Figure 3-, to hold said members so moved outwardly and said toggle joint connection in the position stated. Y

Means are, provided operable after the actuating mechanism has passed through full cycle position to engage the projection of said link and move the links of the toggle joint connection in the opposite direction through and beyond centralized position, when the spring connection will act to move said members inwardly until the rollers thereofcontact high points of said cam; and on the rebound of the parts the' rollers will ride down on the cam and seat in the low points thereof -to locate the actuating mechanism at rest in full cycle position, said means being described asfollows:

The stopping means of the machine has connection II to an arm l2, pivoted at v5, said connection being attached at one end thereof to the free end of said arm 24, and at the other end to the free end of said arm l2, and acting to move the latter into contact with said projection It. The arm I2 is operated as stated against the tension of its spring l3, said spring acting to return said connection and said arm to normal position. The connection llfwhich may be of wire passes transversely of the machine through apertures l4 of the sides of the machine casing in order that it may be attached at its ends as stated, and is guided and protected by engagement with the interior of a coiled spring [5, which also passes through said apertures and is attached at its ends to brackets l6 fixed to the sides .of said cas-v ing.

The release early in the cycle of operation of the machine of the toggle joint connection 3 and contact of the rollers of the arms or members 3, 3, with highpoints of the cam i is herein provided for; rather than later release of said toggle joint connection at the time that the low points of the cam are opposite said rollers, the reason for this being that the cam itself cannot I accomplish such release.

I claim: 7

.1. In a calculating machine having numeral wheels, actuating mechanism therefor, and stop- 55 ping means operable after the actuating mechanism has passed through full cycle position to retard said mechanism and to return the same to full cycle position; means for locating the actuating mechanism at rest in full cycle position including a cam having operating connection with said actuating' mechanism and provided with op posite low points, spring tensioned members engaging'said low points of the cam, said cam acting on initial movement of said actuating mechanism to move said members outwardly against the tension of their spring, means including a toggle joint for holding said members so moved outwardly, and means having operating connection with said stopping means and operable after the actuating mechanism has passed through full cycle position to release said holding means.

2. In a calculating'machine having numeral wheels, actuating mechanism therefor, and stopping means operable after the actuating mechatard said mechanism and to return the same to full cycle position; means for locating the actuating mechanism at rest in 'full cycle position including a cam having operating connection with' towards centralized position against the tension' of said spring. connection, said cam having a projection engaging said toggle joint connection to move the links thereof further outwardly slight 1y beyond centralized position, one of said links having a projection engaging the adjacent of said members to hold said members so moved outwardly, and means having operating connection with said stopping means and operable aiter the actuating mechanism has passed through full cycle position to engage said projection of said link and move said links inwardly beyond centralized position. f EDWARD c. WALTER. 

